Naito is a guy that went into Futaba Yoshioka and Kou Mabuchi's middle school.[1] He was a close friend of Kou, Futaba was attempting to ask him if he knew why Kou disappeared so suddenly but she never did, but instead, her friend Yumi thought that the reason why Futaba keeps looking at Naito is because she likes him too.

Naito was one of Kou's close friend from middle school and was part of the group of boys that were always shown around him. Kou and Naito were also in the same class in their first year of middle school.

Naito was curious about Kou and Futaba's relationship and was wondering if there was something going on with them when they were in their first year of middle school. When Futaba was walking pass on their classroom, Naito asked Futaba if she was going out with Kou, which Futaba says that she hates all guys which left Kou discouraged upon hearing this. Futaba was also curious about Kou's sudden disappearance and was going to ask Naito about it, but it seems like Futaba never did.